For anyone who wants to set up Halo for VR, here are the steps. You can download all the necessary mods at…
http://pcgamingwiki.com/wiki/Halo:_Combat_Evolved).
1. Make sure your installed copy of Halo has been updated to the latest version.
2. Download and install the Halo Custom Edition mod.
3. Download and install the Halo widescreen fix mod.
4. Download and install the Halo FOV mod.
5. Open VorpX Configuration, and check the Cloud files for Halo settings. If one exists for Halo, import, then apply and close.
6. Run Halo single player. Open settings a set the resolution to the highest (I believe it’s 1920×1080). Once in game, hit the F6 key to increase the Field Of View by moving the mouse up and down. Once you find a comfortable spot, hit F6 again to lock it.
My personal preference is to go into the VorpX settings during gameplay, and increase the 3D Separation to really make the 3D pop. I’m still looking for a mod to get rid of the crosshairs. I also don’t know if there’s a 1st person mod for vehicles, but I guess I could get used to 3rd person during vehicle sequences if I had to.